https://devzone.nordicsemi.com/f/nordic-q-a/127517/mcuboot-application-preventing-further-dfuI recently flashed a new application onto devices that has prevented any new application images from being swapped into the primary slot. Any new images are uploaded to the external secondary slot fine, but when swaping it reverts back to the old imageen-USTelligent Community 13Fri, 20 Mar 2026 13:33:32 GMThttps://devzone.nordicsemi.com/thread/563772?ContentTypeID=1Fri, 20 Mar 2026 13:33:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9451673e-8939-423d-bdb1-c61338c10797Einar Thorsrud<p>Hi,</p> <p>I see the partition layout is changed, shrinking both application slots equally to be able to fit a settings region. Changing parition layout in the field is not recommended and will cause problems. In this case, MCUboot which is not updated will use the old partition layout. It is difficult to solve this in a good way for products out in the field (other than sticking with the old partition layout and not using settings).</p><div style="clear:both;"></div>